检索结果-南通市图书馆

Science China(Physics,Mechanics & Astronomy) 2023年第8期66卷 150-161页

作者： Na Wang Qian Xu Jun Ma Zhiyong Liu Qi Liu Hailong Zhang Xin Pei Maozheng Chen Richard N.Manchester Kejia Lee Xingwu Zheng Hans J.Kärcher Wulin Zhao Hongwei Li Dongwei Li Martin Süss Matthias Reichert Zhongyi Zhu Congsi Wang Mingshuai Li Rui Li Ning Li Guljaina Kazezkhan Wenming Yan Gang Wu Lang Cui Ming Zhang Haitao Li Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China Key Laboratory of radio Astronomy Chinese Academy of SciencesNanjing 210008China Xinjiang Key Laboratory of radio Astrophysics Urumqi 830011China Xinjiang Key Laboratory of Microwave Technology Urumqi 830011China Australia telescope National Facility CSIRO Space and AstronomyEpping 1710Australia Department of Astronomy Peking UniversityBejing 100871China School of Astronomy and Space Science Nanjing UniversityNanjing 210093China Dr.Hans Jirgen Karcher Engineering Office Karben 61184Germany Northwest China Research Institute of Electronic Equipment Xi'an 710065China OHB Digital Connect(MT Mechatronics) Mainz 55130Germany Beijing Institute of Architetural Design Beijing 100045China Guangzhou Instiute of Technology Xidian UniversityGuangzhou 510555 China

This study presents a general outline of the Qitai radio telescope(QTT)***,the site of the telescope,is a county of Xinjiang Uygur Autonomous Region of China,located in the east Tianshan Mountains at an elevation of about 1800 *** QTT is a fully steerable,Gregorian-type telescope with a standard parabolic main reflector of 110 m *** QTT has adopted an umbrella support,homology-symmetric lightweight *** main reflector is active so that the deformation caused by gravity can be *** structural design aims to ultimately allow high-sensitivity observations from 150 MHz up to115 *** satisfy the requirements for early scientific goals,the QTTwill be equipped with ultra-wideband receivers and large field-of-view multi-beam receivers.A multi-function signal-processing system based on RFSo C and GPU processor chips will be *** will enable the QTT to operate in pulsar,spectral line,continuum and Very Long Baseline Interferometer(VLBI)observing *** compatibility(EMC)and radio frequency interference(RFI)control techniques are adopted throughout the system *** QTT will form a world-class observational platform for the detection of lowfrequency(nano Hertz)gravitational waves through pulsar timing array(PTA)techniques,pulsar surveys,the discovery of binary black-hole systems,and exploring dark matter and the origin of life in the *** QTT will also play an important role in improving the Chinese and international VLBI networks,allowing high-sensitivity and high-resolution observations of the nuclei of distant galaxies and gravitational lensing *** astrometric observations will also contribute to improving the accuracy of the celestial reference ***,the QTT will be able to support future space activities such as planetary exploration in the solar system and to contribute to the search for extraterrestrial intelligence.

关键词： radio telescope radio astronomy observation receiver RFI

来源：

维普期刊数据库

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Research on actuator distribution and panels for a radio telescope

引用

Research in Astronomy and Astrophysics 2021年第7期21卷 31-36页

作者： Jin-Qing Wang Zheng-Xiong Sun Li Fu Jin-Ling Li Lin-Feng Yu Yong-Chen Jiang Yong-Bin Jiang Wei Gou Wei Hu Rong-Bin Zhao Qin-Hui Liu Zhi-Qiang Shen Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China Key Laboratory of radio Astronomy Chinese Academy of SciencesNanjing 210008China Shanghai Key Laboratory of Space Navigation and Positioning Techniques Shanghai 430074China University of Shanghai for Science and Technology Shanghai 200093China

Trying to achieve the best surface accuracy control with the fewest actuators, this article mainly studies the distribution of actuators and the method of panel design. The influence of the number of faulty actuators on the accuracy of the surface shape is demonstrated. In addition, the method incorporating a triangular panel, node index and the fitting solution method of a single panel is also given. This method provides a reference for the design and realization of an active surface or a deformable sub-reflector for high performance large aperture radio telescopes.

关键词： radio telescope triangle panel method design

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Active sub-reflector research for a large radio telescope

引用

Research in Astronomy and Astrophysics 2020年第1期20卷 69-76页

作者： Jin-Qing Wang Rong-Bin Zhao Yong-Chen Jiang Zheng-Xiong Sun Lin-Feng Yu Li Fu Qin-Hui Liu Wei-Min Zheng Zhi-Qiang Shen Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China Key Laboratory of radio Astronomy Chinese Academy of SciencesNanjing 210008China Shanghai Key Laboratory of Space Navigation and Positioning Techniques Shanghai 430074China

This paper proposes an active sub-reflector suitable for large radio telescopes,which can compensate both of the deformation of the main reflector and sub-reflector position *** mathematical formula of the main reflector deformation compensated by the sub-reflector is deduced based on Cassegrain and Gregory antenna *** position of the sub-reflector is adjustable to compensate for defocusing errors on high and low elevations,which are mainly caused by the deformation of the sub-reflector supporting *** this paper,the method of obtaining the optimum position of the sub-reflector from the aperture phase by the interferometric method is *** actual measurement is verified on the Tianma 65 m radio telescope,which provides a new way to diagnose the position error of the sub-reflector.

关键词： radio telescope deformable sub-reflector model holography phase

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

EFFECT OF FEED ARRAY CONFIGURATION ON THE FIELD-OF-VIEW OF radio telescope ANTENNA

引用

Journal of Electronics(China) 2013年第4期30卷 362-367页

作者： Wu Yang Du Biao Liu Xiaomeng Jin Chengjin National Key Laboratory of Antennas and Microwave Technology Xidian University Joint Laboratory for radio Astronomy Technology

Phased Array Feed (PAF) is a small two-dimensional phased array antenna, playing a role as the multi-beam feed for the reflector antenna. The prominent capability of large continuous Field-of-View (FoV) coverage and fast survey speed makes PAF the promising feed for radio telescopes. In this paper, the effect of feed array of PAF on the gain fluctuations over FoV is analyzed on a sim- plified model of the Five-hundred-meter Spherical Aperture radio telescope (FAST), including illu- mination pattern edge taper, element spacing, element arrangement and element amount. And the differences between rectangular and hexagonal array arrangements are compared. The relationship between the FoV and array configuration are concluded at last.

关键词： radio telescope Phased Array Feed (PAF) Multi-beam Gain

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The Tianma 65 m radio telescope antenna

引用

Astronomical Techniques and Instruments 2024年第5期1卷 247-259页

作者： Biao Du Yuanpeng Zheng Guoxi Liu Yifan Zhang Wancai Zhang Lijun Zhang Shunyou Qin Zhiqiang Shen Qinghui Liu Bin Li Jinqing Wang 54th Research Institute of China Electronics Technology Group Corporation Shijiazhuang 050081China Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China

The Tianma 65 m radio telescope(TMRT)at Shanghai is a fully steerable single-dish radio telescope in China,operating at centimeter to millimeter wavelengths(1.25 GHz to 50 GHz).This paper presents details on the main specifications,design,performance analysis,testing,and construction of the telescope *** measured total efficiency is better than 50%over the whole elevation angle range,first sidelobe levels are less than−20 dB,antenna system noise temperatures are less than 70 K at 30°elevation angle,and pointing accuracy is less than 3″.The measured and calculated results are in good agreement,verifying the effectiveness of the design and analysis.

关键词： radio telescope Reflector antenna High sensitivity Homology design High pointing accuracy

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The Tianma 65 m radio telescope at Shanghai

引用

Astronomical Techniques and Instruments 2024年第5期1卷 239-246页

作者： Qinghui Liu Zhiqiang Shen Xiaoyu Hong Qian Ye Bin Li Jinqing Wang Rongbing Zhao Li Fu Weiye Zhong Lingling Wang Juan Li Zhen Yan Wu Jiang Bo Xia Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China

The Shanghai Tianma 65 m radio telescope(TMRT)is a large,fully rotatable radio telescope with multiple scientific *** main body of the telescope and four low-frequency receiving systems,including L,C,and S/X bands,were completed between 2008 and *** 2013 to 2017,four high-frequency receiving systems,including Ku,K,Ka,and Q bands,were constructed and their performance was comprehensively *** are three main innovations.(1)A fully movable large radio telescope system with advanced performance and complete functions has been built.(2)An advanced,reliable main reflector adjustment system has been completed,overcoming gravity deformation and creating a large antenna with a main reflective surface accuracy of 0.28 mm(root mean square)for any elevation.(3)Five innovative technologies have been developed to achieve high-precision pointing in any direction within 3″.The TMRT has made a crucial contribution to the orbital measurement and positioning of China’s lunar and deep space *** enhancing China's ability to participate in international VLBI observations and radio astronomy,this has facilitated a series of achievements in observational radio astronomical research,in areas such as VLBI,spectral lines,and pulsars.

关键词： radio telescope Tianma Large antenna Receiving system Surface accuracy

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Back Frame Section Size Optimization of Large Aperture telescope

引用

Journal of Harbin Institute of Technology(New Series) 2023年第4期30卷 76-84页

作者： Qinglong Wu Zhan Yao Tanhui Wu Yangqing Hou Huazhen Zhang Qian Xu Na Wang Shanghai YueSheng Information Technology Co Ltd.Shanghai 201109China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China

The back frame structure of a large radio telescope is an important component supporting the reflecting surface,which is directly related to the surface *** optimal design is of key significance for ensuring the surface precision and reducing structural *** methods are constructed to optimize the cross-section size of the telescope back frame in this paper,the criterion method and the first-order optimization *** criterion method is based on the Lagrangian multiplier method and Kuhn-Tucker *** method first establishes the mathematical model by taking the inner and outer radiuses of the back frame beams as the design variables,the structural weight as the constraint condition,and the structural compliance as the objective function,then derives the optimization *** first-order optimization method takes the inner and outer radiuses of the beams as the design variables,the back frame RMS as the objective function,and the structural weight as the constraint *** of RMS,structural stress uniformity and optimization efficiency shows that both algorithms can effectively reduce structural deformation and improve RMS,but the criterion method has relatively better result than the first-order method.

关键词： radio telescope back frame size optimization RMS criterion method first-order method

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Surface shape detection methods for large radio telescopes

引用

Astronomical Techniques and Instruments 2024年第5期1卷 275-283页

作者： Zhengxiong Sun Jinqing Wang Linfeng Yu Yongchen Jiang Zheng Lou Yongbin Jiang Rongbin Zhao Qian Ye Qinghui Liu Guangli Wang Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China Key Laboratory of radio Astronomy Chinese Academy of SciencesNanjing 210023China Shanghai Key Laboratory of Space Navigation and Positioning Techniques Shanghai 200030China University of Chinese Academy of Sciences Beijing 100049China Purple Mountain Observatory Chinese Academy of SciencesNanjing 210023China

The surface accuracy of a radio telescope is directly related to its operational efficiency and detection *** is crucial under high-frequency observation conditions,where surface shape errors need to be controlled to within 1/16 of the working *** addition,the primary reflector of large radio telescopes is subject to dynamic deformation,caused by factors such as gravity and thermal *** paper presents a method for detecting the surface shape of radio telescopes using radio interferometry techniques combined with active reflector adjustment *** enables accurate assessment and correction of surface errors,ensuring the electrical performance of the radio *** study investigates the practical applications of high-precision measurement techniques,such as microwave holography,out-of-focus holography,and wavefront distortion methods at the Tianma 65 m radio telescope(TMRT).Furthermore,the study presents the construction method of gravity models at different elevation angles and demonstrates the efficacy of the active reflector *** results of the measurements indicate that the application of these methods to the TMRT has led to a notable enhancement of the accuracy of the primary reflector and a substantial improvement in efficiency in the *** a process of iterative measurements and adjustments,the surface shape error is ultimately reduced to 0.28 mm root mean square(RMS).

关键词： radio telescope Holographic measurements Surface shape measurements Antenna efficiency

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Pose optimization of the FAST feed support system based on the new feed cabin mechanism

引用

Science China(Physics,Mechanics & Astronomy) 2023年第3期66卷 178-187页

作者： Jianing Yin Peng Jiang Rui Yao CAS Key Laboratory of FAST National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China

The Five-hundred-meter Aperture Spherical radio telescope(FAST) is the largest and most sensitive single-dish radio telescope in the world and has made many important scientific achievements in a few years. Given the enormous scientific research potential of the Milky Way center, it is necessary to enhance the observation zenith angle as close to the Milky Way center as possible. In this regard, a new mechanism for the feed cabin is proposed with cables and sliders, which is lighter in weight and larger in the workspace. This paper will introduce this new feed cabin and the whole feed support system and establish their mechanical models to optimize the relevant control parameters, making FAST achieve an observation zenith angle of at least 50°with satisfying the required constraints. It indicates that the new mechanism designed by the FAST team can be used for the FAST upgrade and the future FAST array project.

关键词： radio telescope cable-driven parallel robot mechanism optimization

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Accuracy Analysis of Stewart Platform Based on Interval Analysis Method

引用

Chinese Journal of Mechanical Engineering 2013年第1期26卷 29-34页

作者： YAO Rui ZHU Wenbai HUANG Peng National Astronomical Observatories Chinese Academy of Sciences Department of Precision Instruments and Mechanology Tsinghua University

A Stewart platform is introduced in thc 500 m aperture spherical radio telescope（FAST） as an accuracy adjustable mechanism for teed receivers. Accuracy analysis is the basis of accuracy design. However, a rapid and effective accuracy analysis method for parallel manipulator is still needed. In order to enhance solution efficiency, an interval analysis method（lA method） is introduced to solve the terminal error bound of the Stewart platform with detailed solution path. Taking a terminal pose of the Stewart platform in FAST as an example, the terminal error is solved by the Monte Carlo method（MC method） by 4 980 s, the stochastic mathematical method（SM method） by 0.078 s, and the IA method by 2.203 s. Compared with MC method, the terminal error by SM method leads a 20% underestimate while the IA method can envelop the real error bound of the Stewart platform. This indicates that the IA method outperforms the other two methods by providing quick calculations and enveloping the real error bound of the Stewart platform. According to the given structural error of the dimension parameters of the Stewart platform, the IA method gives a maximum position error of 19.91 mm and maximum orientation error of 0.534°, which suggests that the IA method can be used for accuracy design of the Stewart platfbnn in FAST. The 1A method presented is a rapid and effective accuracy analysis method for Stewart platform.

关键词： Stewart platform accuracy interval analysis radio telescope

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：